excrescence vs outgrowth

excrescence and outgrowth both are nouns.

Word	Noun	Adjective	Verb	Adverb
excrescence	Yes	No	No	No
outgrowth	Yes	No	No	No

As nouns, outgrowth is a hypernym of excrescence; that is, outgrowth is a word with a broader meaning than excrescence:

excrescence: (pathology) an abnormal outgrowth or enlargement of some part of the body
outgrowth: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of excrescence include appendage, process, growth.

excrescence (noun)	outgrowth (noun)
(pathology) an abnormal outgrowth or enlargement of some part of the body	a natural prolongation or projection from a part of an organism either animal or plant
something that bulges out or is protuberant or projects from its surroundings	the gradual beginning or coming forth
	a natural consequence of development